Electric hoist



Jan. 26, 1954 E. E. RoBlNs ETAL 2,667,331

ELECTRIC HOIST Filed July s1. 1951 s sheets-sheet 2 INVENTORS By Hum/mfgf.' Flr/fer Jam 26, 1954 E. E. RoBlNs ET AL 2,667,331

ELECTRIC HOIST Filed July 31 1951 3 Sheets-Sheet 5 INVENTORS PatentedJan. 26, 1954 ELECTRIC HOIST Erford E. Robins, North Tonawanda, andHum.- phrey F. Parker, Buialo, N. Y., assignors to Columbus McKinnonChain Corporation, Tonawanda, N. Y.

Application July 31, 1951, Serial No. 239,594

' 140mm. (c1. 254-168) This invention relates to hoists, and moreparticularly to light weight motorized hoists of the type adapted to besuspended by means of hooks or brackets from suitable supports, for thepurpose of lifting loads in the various industries.

In hoists of the character described it is of course well known thatutmost compactness in relative arrangement of the several necessarycomponents of such mechanisms is a prime consideration, in the interestsof minimizing the length and width and head room dimensions and overallweight of such devices. It is also known that devices of the characterdescribed may now be designed to include frame elements which are diecast from the relatively light weight metals, while some of the load andwear carrying components thereof are preferably formed of heavier metalswhich may be mounted in the frame structures in the form of insertstherein.

It is an object of the present invention to provide in a hoist of thecharacter described an improved structural arrangement whereby the loadcarrying and wear receiving hard metal portions thereof and the lightweight die cast metal frame and cover portions thereof may be separatelyfabricated and then relatively assembled with improved facility while atthe same time providing a complete hoist mechanism of utmost strengthand ruggedness.

Another object of the invention is to provide a hoist mechanism asaforesaid, which is adapted to be disassembled and reassembled forrepair and/or maintenance with utmost facility.

Another object of the invention is to provide an improved hoistmechanism of the character described which is readily convertible foruse either as a single or double reeved type.

Another object of the invention is to provide in a hoist of thecharacter described structural components of improved form whereby tofacilitate initial assembly and/or subsequent service disassembly andreassembly of the mechanism.

Other objects and advantages of the invention will appear from thespecication hereinafter.

In the drawing:

Fig. 1 is a side elevational View of a single reeved electric hoistmechanism of the invention, with portions broken away and shown insection to further illustrate the internal mechanism;

Fig. 2 is a section taken along line II-II of Fig. l;

Fig. 3 is a fragmentary section taken along line III-III of Fig. 2;

Fig. 4 is a fragmentary section taken along line IV-IV of Fig. 2;

Fig. 5 is an end elevational view of the hoist mechanism of Fig. 2converted to double reeve type with portions broken away and showing theinternal mechanism in section;

Fig. 6 is a sectional view corresponding to 2 of application of the thewire rope type;

Fig. invention in a hoist of Fig. 7 is a fragmentary section, on anenlarged scale, taken along line VII-VII of Fig. 6; and

F ig. 8 is a fragmentary section, on an enlarged scale, taken along lineVIII-VIII of Fig. 6.

The invention is illustrated in Figs. 1 4to 5 inclusive as beingembodied in a hoist mechanism comprising generally a pair of matingframe parts I0, I2; said frame parts being die cast of light weightmetal such as a suitable aluminum or magnesium alloy or the like. Attheir inner faces, the frame pieces `lil-.I2 are formed with integralend plate portions I3, I4 which include thickened mating rim portionsl5, I6 through which extend assembly bolts IB for holding the two frameparts together subsequent to assembly of the various mechanismcomponents therein, as will be explained hereinafter.

As shown in Fig. l, the generally cylindrically shaped casing portion I0is dimensioned to house the electric drive motor field windings and core2t within which rotates the motor armature 2| to drive the motor shaft22. As indicatedat 2A a ball bearing device rests within a suitable seatportion 25 of the end plate I3 of the frame meme ber it; and the reducedend portion of the motor shaft 22 is thereby carried by the bearing 24for free rotation relative to the hoist frame. spline sleeve 26 is whichis keyed to the load lift wheel 3,3. The

load uit when ss is rotatably mounted within the frame assembly by meansof a pair of ball bearing devices Sli-35,' the ball bearing 34 lbeingmounted in a suitable seat portion of the end plate i3 while the'bearing 35 is mounted in a seat portion of the end plate I4, aswill beexplained in more detail hereinafter.

As shown in Fig. 2, the hoist load chain 36 trains over the load liftwheel 33 andat one end connects by means of a link 31 and pin 3,6(Fig. 1) to the iooo uit hook en.

cared at ai into connection with o. deadheiid hanger ooit 42 (Figs. 2and 5); the head and of the hanger bolt ,42 being embedded in matingrecess portions of the frame e 3 2, 4) and vcooperating ledge portions41 formed integrally with'the end plates I3, I4. Thus, the chain guide44 is mounted to embrace the load lift chain 36 as it trains over theload lift wheel 33 incidental to operation of the hoist; the chainvguide 44 being fabricated of wear resistant'material such as steel orthe like's'o as to Vthereby properly guide the chain While protecting.the hoist frame parts from wear. Y, Y

As shown in Figs. 1, 2, 3, the hoist suspension hook 50 is formed with areduced shank portion 5I terminating in an enlarged head 52, and theshank portion 5I mating semi-cylindrical recess portions formed in theend wall portions of the frame members IB-I2. To provide a suitable loadbearing for the enlarged head 52 against the split frame parts, weprovide a generally U-shaped hard metal washer 54 which spans thejuncture between the frame parts Ill-i2, and due to the U-shape thereofit may be readily slip-fitted upon the hook shank 5I during assembly ofthe parts and just prior to bolting of the two frame parts I5, I2 inmating relation about the hook shank. As indicated at 55 (Fig. 3), oneside of the washer 54 is formed with an extending tab portion to matewith a correspondingly recessed portion of the frame piece I2 whereby toinsure proper positioning of the washer and to lock the washer 54against unintended slipping out of engagement with the hook shank andhead portion 52.

As shown in Fig. l, a suitable automatically self-energizing load brakemechanism 6! is coupled to the outwardly extending end portion of thedrive shaft 28 and arranged to be operated by means of a solenoidmechanism indicated generally at 52; the brake and solenoid mechanismsbeing conveniently housed within a suitable detachable cover 54. At theopposite end of the hoist the motor compartment may also be convenientlyenclosed by means of a detachable end cover 65 with bolts 66; the endcover 65 including a motor end thrust bearing 51, and thus it will beseen that a symmetrically dimensioned and balanced hoist mechanism isreadily provided wherein-the suspension hook and load lift wheel andload hook devices are all centered alongY the plane of juncture of thetwo main frame parts, while the driving motor is housed within oneextending end portion of the housing structure and the gear reductionand load brake mechanisms are housed within the opposite extending endstructure. Thus, an overall assembly of utmost compactness is achieved,and yet by virtue of the constructional arrangement of the invention theinitial assembly and subsequent disassembly and/ or assembly operationsgreatly facilitated as will be understood from the following descriptionof those operations.

For assembling of the mechanism of the invention, the bolts I3 are firstslipped into place in the frame member I2, and the latter is then peenedover the heads of the bolts to hold them from slipping out of place. Theframe member I2 is then set upon a workbench with the inner end thereoffacing upwardly, whereupon the load Wheel 33 with the bearings 35 isinserted therein. Preferably the bearings are designed to pressfit theload wheel shaft and to slip-fit freely into `the frame I2. The lowerhalf portion of the chain guide 44 is then set into position. The hook50 and the bearing washer 54 therefor, and the dead end bolt 42 and thehanger bolt 15 (if used) are then set into position to lie within arekof the hook is enclosed within l tion Yupon the bolts the appropriaterecesses of the end fa'ce" of the yframe I2. The upper half of the chainguide 44 Y is then mounted in the frame piece I0, and the frame piece I0is then lowered down into posi- I8 and the nuts thereof are tighteneddown to lock the frame parts lI-IZ together. The stator portion 25 ofthe motor is then slip-fitted into the frame I0 from the upper endthereof until it lodges in position against suitable stops formedtherein, and is positionally locked as by means of a set screw Ii (Fig.l). The rotor sub assembly including the spline bushing iii-and thebearing 24 is then inserted into operative position. The end plate 55carrying the rotor bearing 61 is then set in position and locked thereonby means of the bolts 66.

The assembly is then turned up-side-down on the workbench and the gear32 is then lowered into the casing I2 into keyed position upon the loadwheel shaft; a snap ring being then utilized to lock the gear on theshaft. The drive shaft 28 is then lowered into position, carryingtherewith the integral pinion 29; and then the interconnecting gear andshaft devices of the speed reduction unit are set into position tointerconneet the pinion 29 and the gear 32, The auxiliary frame piece 3iis then set in position on top of the frame piece I2 and locked theretoas by means of bolts II2 (Fig. 1) and then the load brake mechanism ismounted upon the outwardly extending end portion of the shaft 28. Then,subsequent to completion of the wiring connections the cover piece 64 ismounted in position and locked on the assembly by means of bolts H4.Thus, as illustrated and described hereinabove the hoist mechanism isassembled for single reeve operation.

To provide the hoist mechanism so as to be readily convertible to doublereeve type, the mating surfaces of the frame pieces I--IZr are providedwith matching semi-cyclindridal recesses as indicated at 1--12 (Fig. 3);the recessed portion 12 being topped by a square recess formation 13.Thus, the recess 13 provides accommodation for the square head portion14 of a load chain anchor bolt 15 (Fig. 5) which engages at its lowerthreaded portion within a threaded sleeve 16 which in turn connects bymeans of a pinV 11 with the upper end of the return strand 18 of theload chain 35 after the latter has been trained downwardly and throughand upwardly from a lower pulley block 19 carrying the load hook 80. Asshown in Figs. 2, 5, the mating surface portions of the frame piecesI-IZ are square-recessed as indicated at 8| to receive therebetween thesquare outer surface of the threaded sleeve 16, thus holding the sleeveagainst rotation relative to the frame. This permits the bolt 15 to berotated relative to the sleeve 15 preliminary to assembly of the deviceso as to obtain any required vertical adjustment of the sleeve withinthe frame preliminary to assembly thereof. It will of course beappreciated that incidental to use of the hoist device as a double reevetype, the load center line will thereby shift to a position betweentheload lift wheel 33 and the load hanger bolt 15, and for that reasonthe s uspension'h'ook 5I) will then be mounted in the opening 1B in lieuof in the opening 53 which is employed in conjunction with a singlereeve type assembly. A press fitting cap device 34 (Fig. 2) is providedto close the upper end of the opening 14 whenever the latter is not inuse, thereby keeping foreign material out of the hoist casing.

Figs; 6, 7, 8 illustrate application of the inven- 5 tion to a wire ropetype hoist. In this case the hoist frame is generally similar to that ofthe form of the invention shown in Figs. 1-5; that is, the framecomprises a pair of mating die cast frame parts, one of which isillustrated and designated 90 in Fig. 6. The other frame part isillustrated and designated 9| in Figs. 7 and 8. The hoist frame parts90, 9| are preferably formed of die cast metal and have meeting rimparts 92 at the central plane of junction between the frame parts whenassembled. Bolts 94 are employed to hold the frame parts together, andas explained hereinabove the meeting faces of the frame parts aresuitably recessed so as to accommodate the shank portion 95 of asuspension hook device 96; the enlarged lower head portion 91 of thehook being arranged to cooperate with the bearing washer 98 to completethe assembly of the suspension hook to the hoist frame.

As shown in Fig. 6, the hoist includes the usual driving drum 99 uponwhich winds the wire rope |00, and the load end of the rope is shown astraining down and through and upwardly from a sheave block |02 whichcarries the load lift hook (not shown). The end of the rope |00 isanchored to the hoist frame by means of a swivel headed anchor sleeve|04 which is rigidly xed to the end of the rope and seated upon acounterbored bearing plate |05. The bearing plate |05 is accommodatedWithin suitably dimensioned key slide recesses |06 formed in the matingsurfaces of the frame members 90, 9|, whereby it will be appreciatedthat the bearing plate |05 may be readily assembled relative to thehoist frame while the hoist frame pieces 90, 9| are being broughttogether into assembled relation. Then, upon fastening of the bolts 94the bearing plate |05 is locked in position within the frame for propersupport of the anchor sleeve |04.

To permit the anchor sleeve |04 to be readily assembled and/ordisassembled from the hoist frame without disassembly of the hoist frameby disconnection of the bolts 94, we provide in the bearing plate |05 akeyhole shaped slot |01 (Fig. 8), whereby it will be seen that theanchor sleeve |04 may be displaced laterally into the enlarged apertureportion of the opening 01 for withdrawal of the end of the wire rope |00from the hoist frame. However, to prevent unintended displacement of thewire rope end from the hoist frame we provide a screw plug |08 which isinserted in screwthreaded relation within the larger aperture portion ofthe opening |01 subsequent to assembly of the device. Then, in order todisconnect the end of the rope |00 from the lhoist frame it is onlynecessary to unscrew the plug |08 and to then pull the anchor sleeve |04to the right as viewed in Fig. 6, whereupon the end of the rope willcome free from the hoist.

Thus, the hoist mechanism of Figs. 6, 7, 8 also employs the principle ofpaired frame pieces having suitably recessed matching face portionsadapted to accommodate the various stress carrying and wear receivingcomponents of the mechanism, whereby the entire hoist structure may bereadily assembled by simply slip-fitting the various components intoposition and then bolting the paired frame members together into nallyassembled relation. It will of course be appreciated that whereas only afew forms of the invention have been illustrated and described in detailherein, that various changes may be made therein without departing fromthe spirit of Vthe invention or the scope of the appended claims.

We claim:

1. A hoist comprising in combination, a pair of main frame members diecast of relatively light weight metal, said main framemembers being ofgenerally cylindrical form and each having an inner end wall portionformed to meet the other at rim portions thereof to provide a plane ofjunction therebetween, bolt means detachably interconnecting said mainframe members, bearing means carried by said end wall portions of saidmain frame members and mounting therein a load lift wheel, motor meansmounted within one of said main frame members and having its rotor shaftin keyed connection with a drive shaft extending through said load liftwheel, speed reduction gear means carried within the other ci said mainframe members and having driving connection with said drive shaft, theoutput portion of said speed reduction gear means being geared to saidload lift wheel, said end wall portions of said main frame members beingsymmetrically recessed and accommodating in clasped relationtherebetween at the top portion of said main frame members a suspensionhook device and in the region of said load lift wheel a chain guidedevice and at a side portion of said hoist a chain dead end anchor boltdevice.

2. In a hoist, a multi-piece metal frame comprising a pair of main framemembers having end wall portions adapted to meet in assembly, detachableconnection means maintaining said frame members in assembled relation,said frame end wall portions being recessed to accommodate in claspedrelation -therebetween the shank portion of a headed suspension hook,and a bearing washer disposed beneath the head portion of said hook andbeing generally U-shaped so as to be adapted to slip-nt laterally uponsaid shank portion of said hook and to thereupon lie between the headedportion of said hook and the meeting portions of said frame members,said washer having a tab portion extending therefrom residing in arecessed portion of one of said frame members thereby preventingrotation of said washer relative to said frame members.

3. In a hoist, a pair of main frame members detachably connected toprovide a single main frame assembly, said frame members having opposedend wall portions meeting in abutment upon assembly thereof, said endwall portions being symmetrically recessed to accommodate in claspedrelation therebetween the head and shank portion of a bolt device havingan end portion extending from said frame assembly for attachment theretoof the dead end portion of the load lift chain of said hoist.

4. A hoist comprising a pair of main frame members detachably connectedto provide a unitary main frame structure, said frame members eachhaving an end wall portion abutting the end wall portion of the otherframe member when in assembled position, a load wheel mounted forrotation upon said frame end Wall portions, said end wall portions beingsymmetri-` cally recessed to accommodate in clasped relationtherebetween a chain guide device comprising a channel sectioned`wear-resistant metal member embracing said load wheel, said chain guidedevice having bent tab portions extending in opposite directions andlaterally engaging portions of the end wall portions of said framemembers for holding said chain guide device in operative position withinsaid frame structure.

aeeaesi 5. In a. noise, a pair of'fraie parts, detachabry ture, said'frame parts having mating end wall,

portions with a Vplurality of matching recesses therein to accommodatetherebetween at selec-V tive positions a suspension hook, said end wallportions being also recessed: at a position spaced from the aforesaidrecesses to accommodate therebetween the head and shank portion of adead end suspension anchor device.

7. A hoist device comprising a pair of frame members detachablyinterconnected to provide a unitary frame structure, said frame membershaving end wall portions adapted' to meet in` abutting relationuponassembly thereof, said end wall portions being recessed incomplementary fashion to clasp in locked relation therebetween a bearingplate, said bearing plate having a keyhole shaped aperture therein, thelarger portion of said keyhole shaped aperture being screwthreadedandhaving mounted in threaded relation therein `a screw plug, the smallerportion of said keyhole shaped aperture being counterbored to receive inbearing relation thereon a =ball shaped' hoist cable anchor member.

8. A hoist device comprisinga pair of frame members detachablyinterconnected to provide a unitary frame structure, said frame membershaving end wail portions adapted to meet in' abutting relation uponassembly thereof, said end wall portions being recessed in complementaryfashion to clasp therebetween a keystone sectioned bearing plate inlocked relation therebetween, said bearing platev having a bearingapertureY therein carrying thereon a ball shaped hoist cableanchormember.

9. In a hoist', a multi-piece metal frame comprising a pair of mainframe members having end wall portions adapted' to meet inY assembly,detachable connection means maintaining said frame members in assembledrelation, said frame members end` wall portions each being recessed toaccommodatein clasped relation therebetween the shank portion of aheadedY suspension hook, anda bearing washerdisposed beneath the headportion of said hook and being non-circular in shape and residing incomplementarily recessed portions of saidv frame members therebyVpreventing rotat-ion of said washer in use.

10; In a hoist, a pair of main frame members detachably connected toprovide a single main framefassembly, said frame members having opposedend r wall portions meeting in abutment upon assembly' thereof, saidyendi wall portions being symmetrical-ly recessed toA 'accommodate inclaspedrelation therebetween at one position one end of ahoistisuspension device and at another position'onezend of a dead end.anchor device.

f V11'. A hoist comprising a pairY of main frame members detac'zhably`connected to provide a unitary main frame' structure, a loadv wheelmounted for' rotation'. within said frame structure: and. spanningV the:juncture vbetween said frame members, said frame members each havan endwall portion abutting the end wall portionofthe other frame Vmember whenin assembled position and said' end wall portions being symmetricallyrecessed to accommodate in clasped relation therebetween rat oneposition a hoist suspension device and at another position achain guidedevice comprising achannel-sectioned wear-resistant metal memberembracing said. load wheel.

12.. In a hoist, a multi-piece metal frame com- `prising a pair of mainframemembers having end wall portions adaptedV tormeet in assembly,detachable Vconnection means maintaining said frame members in assembledrelation,.said frame members having opposed end. wall portions eachrecessed to accomodate in clasped relation therebetween one end of aheaded suspension device when said frame members are in assembledrelation, and a substantially U-shaped wear resistant washer devicedisposed beneath the head portion of said suspension device and beingshaped to resist rotation relative to said framemembers.

13. A hoist comprising in combination, a pair of main frame members ofmetal,L said main frame members being of generally cylindrical form andeach having. an inner end wall portion formed to-meet the other at rimportions thereof, means detachably interconnecting said main frame.members, bearing means carried by said main frame lmembers and mountingthereiny a load lift wheel, motor means mounted within oneof said' mainframe members and having its rotor shaft in keyed connection with adrive shaft extendingr through said load lift wheel, speed reductiongear means carried within the other of said main frame members andhaving a drivingl connection with said drive shaft", rthe output portionof said speed reduction gear means being geared to said load lift wheel,said end wall portions of said main frame' members being match-recessedand accommodating in clasped relation therebetween a hoist suspensiondevice.

14. A. hoistv comprising in combination, a pairV of frame members ofcast metal, said frame members being` of generally cylindrical form andeach having an inner end. wall formed to meet at rim vportions thereof,means detachably interconnecting said frame parts, bearing meansvcarriedby said frame members and mounting therein a load lift wheel,motor meansmounted within oneV of said. frame membersv and having itsrotor shaftr inv keyed connection with a driveV shaft extending throughsaid load' lift wheel, speed reduction gear means carried' within theother of said' frame members and having driving connection with saiddrive shaft; the Aoutput portion ofsaid speed reduction gear means beinggeared to said' load lift wheel, said end wall portions of said frame.members beingA match-recessed'. to accommodate in clasped relationtherebetween at diierent positions on said frame members a suspensiondevice and chain guide device and a chain dead end anchor bolt device.

ERFORD E. Rom-Ns. vnoix/rentrer F. PARKER.

References Cited inv thev iile of this patent vUNi'l'ED STA'IES PATENTSNumber Name Date 910,798. Duntley .Jan. 26, 1909 1,580,411 Coffmg Apr.13, 1926 2,246,923. Meunier ,----J une 24, 1941 Parker Apr. I1', 1950

